pub fn default_headers(
  config: config.Config,
) -> List(#(String, String))

pub fn merge_headers(
  left: List(#(String, String)),
  right: List(#(String, String)),
) -> List(#(String, String))

pub fn with_content_type(
  headers: List(#(String, String)),
  value: String,
) -> List(#(String, String))

pub fn with_depth(
  headers: List(#(String, String)),
  depth: String,
) -> List(#(String, String))

pub fn with_if_match(
  headers: List(#(String, String)),
  etag: option.Option(String),
) -> List(#(String, String))